Income Taxes - Reconciliation of Differences between Income Tax Provision (Benefit) and Income Tax Determined by Applying US Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
U.S. federal statutory taxes		$ 8,417	$ 1,305	$ (4,826)
State and local taxes, net of U.S. federal benefit		1,061	(418)	(650)
Permanent items		225	198	96
Federal credits		(566)	(54)	(59)
Other		244	46	(275)
Increase (decrease) in valuation allowance		(19,930)	(68)	3,109
Total income tax provision (benefit)	$ 10,900	$ (10,549)	$ 1,009	$ (2,605)